Intel 4 620 JM80547PG0722MM Ficha De Dados
Códigos do produto
JM80547PG0722MM
88
Datasheet
Features
6.2.2.2
Enhanced HALT Powerdown State
Enhanced HALT is a low power state entered when all logical processors have executed the HALT
or MWAIT instructions and Enhanced HALT has been enabled via the BIOS. When one of the
logical processors executes the HALT instruction, that logical processor is halted; however, the
other processor continues normal operation.
or MWAIT instructions and Enhanced HALT has been enabled via the BIOS. When one of the
logical processors executes the HALT instruction, that logical processor is halted; however, the
other processor continues normal operation.
The processor will automatically transition to a lower frequency and voltage operating point before
entering the Enhanced HALT state. Note that the processor FSB frequency is not altered; only the
internal core frequency is changed. When entering the low power state, the processor will first
switch to the lower bus ratio and then transition to the lower VID.
entering the Enhanced HALT state. Note that the processor FSB frequency is not altered; only the
internal core frequency is changed. When entering the low power state, the processor will first
switch to the lower bus ratio and then transition to the lower VID.
While in Enhanced HALT state, the processor will process bus snoops.
The processor exits the Enhanced HALT state when a break event occurs. When the processor exits
the Enhanced HALT state, it will first transition the VID to the original value and then change the
bus ratio back to the original value.
the Enhanced HALT state, it will first transition the VID to the original value and then change the
bus ratio back to the original value.
6.2.3
Stop-Grant State
When the STPCLK# signal is asserted, the Stop-Grant state of the processor is entered 20 bus
clocks after the response phase of the processor-issued Stop Grant Acknowledge special bus cycle.
clocks after the response phase of the processor-issued Stop Grant Acknowledge special bus cycle.
Since the GTL+ signals receive power from the FSB, these signals should not be driven (allowing
the level to return to V
the level to return to V
TT
) for minimum power drawn by the termination resistors in this state. In
addition, all other input signals on the FSB should be driven to the inactive state.
BINIT# will not be serviced while the processor is in Stop-Grant state. The event will be latched
and can be serviced by software upon exit from the Stop Grant state.
and can be serviced by software upon exit from the Stop Grant state.
RESET# will cause the processor to immediately initialize itself, but the processor will stay in
Stop-Grant state. A transition back to the Normal state will occur with the de-assertion of the
STPCLK# signal.
Stop-Grant state. A transition back to the Normal state will occur with the de-assertion of the
STPCLK# signal.
A transition to the HALT/Grant Snoop state will occur when the processor detects a snoop on the
FSB.
FSB.
While in the Stop-Grant State, SMI#, INIT#, BINIT#, and LINT[1:0] will be latched by the
processor, and only serviced when the processor returns to the Normal State. Only one occurrence
of each event will be recognized upon return to the Normal state.
processor, and only serviced when the processor returns to the Normal State. Only one occurrence
of each event will be recognized upon return to the Normal state.
While in Stop-Grant state, the processor will process a FSB snoop.
6.2.4
Enhanced HALT Snoop or HALT Snoop State, Grant Snoop
State
State
The Enhanced HALT Snoop State is used in conjunction with the new Enhanced HALT state. If
Enhanced HALT state is not enabled in the BIOS, the default Snoop State entered will be the
HALT Snoop State. Refer to the following sections for details on HALT Snoop State, Grant Snoop
State and Enhanced HALT Snoop State.
Enhanced HALT state is not enabled in the BIOS, the default Snoop State entered will be the
HALT Snoop State. Refer to the following sections for details on HALT Snoop State, Grant Snoop
State and Enhanced HALT Snoop State.